题干

下面有关硅的叙述中,正确的是

A:硅原子既不易失去电子又不易得到电子,主要形成四价的化合物

B:硅是构成矿物和岩石的主要元素,硅在地壳中的含量在所有的元素中居第一位

C:硅的化学性质不活泼,在自然界中可以以游离态存在

D:二氧化硅在电子工业中,是最重要的半导体材料

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答案(点此获取答案解析)

A

同类题1

任务型阅读

    Traveling for business or pleasure can easily damage your health. It's easy to fail into the trap of high caloric meals and little exercise.____

    Keep a dictionary on hand

    If you are traveling somewhere with a different language, pack a dictionary and keep it close to help you negotiate(商议)the menu and make healthy food choices.____Look up the words that you don't understand to help you learn about cooking methods and ingredients(材料)so that you can choose healthy food.

    ____

    The more you can research before your trip, the easier it will be to keep a healthy lifestyle while traveling. To stay on track with your food, try to find a nearby grocery store or healthy food store, look up a couple of well rated restaurants that offer some healthy choices, and try to stay somewhere with a fridge or kitchen.

    Walk every day.

    Exploring your destination(目的地)on foot is an amazing way to take some exercise while traveling. Walk through the nature to enjoy its beautiful scenery, listen to the sound of nature and take some wonderful pictures.____

    Rent a bike.

    Cover more ground while burning calories by renting a bike. Many major cities have bike-sharing programs, or you could contact a local bike store to ask about bike rentals.____If you have an open schedule, you could even research bike tours, which are a great way to cover a long distance in a short period of time.

A. Avoid junk food and deep fried food.

B. Research the food and store some upon arrival.

C. Take a bike map of the city, research day trips and get exploring.

D. If you are exercising while traveling, make sure to take in extra water.

E. Here are some healthy travel tips which will keep you in good health.

F. You can't avoid deep fried food if you don't know that they're in there!

G. This is also a great way to find hidden attractions that aren't in the travel guides.

同类题4

史实与推论:科学全面地解读史实,可以得出正确的历史推论。请对下面表格中的推论作出判断。


 史实

推论

正确与否

①

“东方红太阳升,中国出了个***,他为人民谋幸福,他是人民大救星。”     

──《东方红》 

***领导中国人民实现了民族的解放和国家的独立,社会主义制度在我国建立。

____

②

“驱散乌云见太阳,革命道路多宽广。毛主席呀红太阳,救星就是共产党。翻身农奴把歌唱,幸福的歌声传四方。”  ──《翻身农奴把歌唱》

农奴翻身做了主人,西藏和平解放,祖国实现统一。


____

③

十一届三中全会高度评价了实践是检验真理的唯一标准问题的讨论。

使我党重新确立了正确的思想路线。


____

④

2003年我国进出口贸易总额达8500多亿美元,比1978年增长了近四倍。外商在我国投资项目累计达40多万个,我国连续多年成为利用外资最多的发展中国家。

对外开放的扩大,极大的促进了我国对外贸易的发展。


____

⑤

1954年制定的《中华人民共和国宪法》规定:“各少数民族聚居的地方实行区域自治。”

 民族区域自治是我国的一项基本国策,也是我国的一项基本政治制度。


____

⑥

改革开放迈不开步子,不敢闯,说来说去就是怕资本主义的东西多了,走了资本主义道路。要害是姓‘资’还是姓‘社’的问题,判断的标准,应该主要看是否有利于发展社会主义社会生产力,是否有利于增强社会主义国家的综合国力,是否有利于提高人民的生活水平。

 邓小平的南方讲话,解放了思想,有利于我国改革开放和现代化建设的进一步发展。


____

同类题5

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